Additional air supply for warm-air furnaces



April 3, 1928. R. JUDD ET L ADDITIONAL AIR SUPPLY FOR WARM AIR FURNAGES 2 Smets-Shea?, E,

` Filed Jan. 24, 1927 f. LEBE? ET AL,

ON/l-.L AR SUP'LLY FOR WARM AIR FURNACES Filed Jan. '14927 2 Sheets-Sheet 2 Patented Apr. 3, 1928.

UNgLT ETD;`

PAT ENT oel-fic RICHARD JUDD,' ERNEST T AYLOR, AND RALPH S. M NANEY, OFDOWAGIAC, MICHI- GAN, AssreNoRs 'r IGAN, A 'conronnfrron o E MICHIGAN;

f PREMIER wLA'RMAiR HEATER' GOM'EANY, oEDoWn'eIAc, Mien'- ADDITIQNA'L AI-RY'SU'PPLY FOBL WARM-AIR F'URNAGES.-

VApplicationledl'muiaryi24, ,19.27. SeriaLNo, 163,220.

Thi'sinvention--relates generally to warm air: furnaces andgrefers. morer particularly to tnieans,`v for. insuring .g the completef combustion ofthelfuel offsuch furnaces.r One of,

to-fv the' combustion chamber, isbuilt into the furnace and' forms a; component part thereof.

With these Iand, other. objects` in view, the invention resides in certain novel features of construction, combinations'and arrangef ments ofv parts as wil1=be more'fully 2.0i claims.-

In the drawings: liigurey 1; is af, front elevationsoffy the vfurnace with the fuel door in-,openiposition Figurep2 isa sectional viewvofl the furnace, 25

reference'v indicate; likey parts, the. numeral l Y designatesa warm air furnace built inv accordance with our inventiony 1n.` which 2' indicates the., combustion chamber, 3 the lire' 30 boxv and, 11C-the grate mounted directly. below.

the fire box. Asshown the lirebox 3 consists .ofA upper and. lower. annular. sections 5 and 6; respectively, the upper section being provided :with spaced ribs. 7, while; thelower 35` section isi provided with 'spaced longitudi-H nally extending pockets Slopen` at their lowerk ends and Vhaving innen longitudinal aperturesi9. Withthis arrangement some. of the air` enteringtheifurfnace below the'grate willv 4.9,. be directed into the pockets @lf-and out through the apertures, :9 intoL contact with the sides of nneasethecombustion of` the fuel;

Asfrshewn th i upper portion: of the: Geminis:l

4x5; tion.. chamber isroundedas at 1QA andis prof vided; with: central opening; 11 vfor the passage; of the-lgasesqt'o a; radiator.' 1-2 There is also provideda lateral passage 13 communicating with.. the C0nubustifinv Chamber ,50; through' which the: fuel is introducedinto.

described, and particularly pointed out in the appended f escape into thetopof the; combustion cham- 'I0l In thedrawings wherein like characters of,

the. fuel bed and-@thus greatly` thefurnace, this. passage beingprovided with a doorlt` at .itsg outer: end.

The furnace ofthe present invention is adaptablefor the` use ofheither harder soft; coal. Ithasbeen found that itx ispract'ically-t 55 impossible to have complete combustionV of softj cualifit is, burned in thelusual manner wit-hair being introduced from the bottom of the furnace only.- Therefore, in theevent that soft coal islto be used, means have been 00 1, provided for introducing an auxiliary air supply into the top of thecombust-ionchamber. It is very important` that; this additional air bey in" aheated' conditiQI1-when. it enters the top. of thev c oinblistion chamber. so that it will vproduce secondary combustion. For accomplishing this weprovide means for allowing the air to enter, through the .door *14;` and; travel in a circuitous path and' finally ber.`

As shown theydoorl 114; is provided with inner and outerwallsl andfl respectively, joined at their outer edges so as. toeforin a chamberl -17 Within the door. Positioned 75 between the walls 15 and 16 centrallyof the door and rigidly.l secured toA each wall is y an inverted: U-shaped memberv 18- surrounding an opening 19 in the outer wall 16' ofthe door chamber. A` small door :20 is-supported 80 upon the outer Walll 16 and is adapted; to close the opening 119. At the upper end of` the large door 14, the inner wall lvis broken away to provide openings 21 andI there are. provided inwardlyextending flanges 22 'par- 85 tially surrounding the .openings 2liv and; which areadapted tocooperate with the outer end portions of channels-23 for forming continuous: air .passages to the combustion. chainber .when thedoor 14,V isin closed position.

As; shown the channels 2 3l are; preferably 03Stintegral with the: furnace; structuraand are'positioned` at each; upper corner of the. lateral` passage 131. .V'jhe'n the doori 'l isl closed the anges 22 are adapted to-,overlap 96; the outer end pontions-.fof the-` channels.v 23 so arltoprioizide a tight fit for preventing theescapeiof air. l The construction and arrangement issuch A that the U-shaped member 1,18, is: adapted 'to- 1,119

divide the chamber 17 into a pair of circuitous passages. When the small door 20 is held in open position, air from the exterior of the furnace will enter through the open ing 19 and will be directed downwardly into the bottom of the chamber 17, then upwardly in a divided stream to the top portion of the chamber 17 and finally will pass in through the channels 23 to the top portion of the combustion chamber.

The air will be heated d uring its passage from the opei'iing 19 in the door 1;-lso that when it escapes out of the inner end portions of the channels 23, there willv be generated enough'pressurc for ejecting the warm air straight across the combustion chamber where it will impinge against the rounded portion l() and will be directed downwardly in a swirling motion so as to thoroughly mix with the incompletely burned products of combustion.

The door 14E may be constructed as a single integral unit or as -shown in the drawings it may be divided into -upper and lower sections 24 and 25 if found desirable. Also any suitable means (not shown) may be used for automatically opening and closing the small door asis found desirable.

From the foregoing it will be apparent that we have provided an additional air supply for the furnace which makes it more efficient in operation because it materially helps combustion of the fuel and eliminates much of the smoke and soot incident to the burning of soft coal. As is also apparent,

we have provided a construction which may be manufacturedwith the furnace as a whole andnot as a separate attachment which must be applied to the furnace either when it is assembled or after the assembling operation has been completed.

IVhile it is believed that from the foregoing description, the nature and advantage of our invention will be readily understood, we desire to have it understood that we do not limit ourselves to the specific construction herein shown and described and that such changes may be resorted to when desired as fall within the scope of the claims.

`What we claim as our invention is:

l. In a warm air furnace, the combination of a combustioi'i chamber, a fuel supply passage therefor, a door for said passage and means for directing a supply of air into said combustion chamber1 including a channel extending longitudinally of and cast integrally with the walls of said fuel supply passage at the top portion thereof and a cooperating channel in said door adapted to communicate with the aforesaid channel when the saidv door is infclosedposition.

2. In a warm air furnace, the combination of a combustion chamber, a lateral fuel supply passage therefor, longitudinally eX-.

tending channels located therein and having therewith circuitous air passages when the said door is in closed position.

In -a warm air furnace, the combination of a combustion chamber, a lateral fuelsupply passage therefor, longitudinally extending channels located thereinand having their inner end portions opening into the combustion chamber, a door for said fuelV supply passage having spaced inner and outer walls forming a chamber provided with a centrally disposed opening in its outer wall, an inverted U-shaped member secured between the walls of said door chamber and surrounding'said opening and having the legs thereof spaced from the bottom and sides of the door-chamber and Yforming therewith separate passages-for the incoming air, the upper portions of the inner wall of said door chamber being provided with spacedv openings adapted to registerv witlr the outer end portions of the fuel supplyV channels when the said door is in closed position. Ll

4. In a-warm air furnace, a substantially cylindrical combustion chamber having theVV upper portions of itswalls curved inwardly, a fuel supply passage for said combustion chamber, a door for said passage havingf'an air passage therein, a channel extending longitudinally ofthe top portion of saidl fuel supply passage and having its outer end portion communicating with the airpa's-v` sage in said door, the inner end of said chan nel opening into the combustion chamberv opposite a portion of the upper curved' surface thereof, whereby the warm air escaping from said channel will travel across said.l combustion chamber and impinge against., the said curved surface and will bedirected downwardly in a swirling motion so as to thoroughly mix with the incompletely burned productsof combustion.

5. In a warm air furnace, a substantially cylindrical combustion chamber having the upper portions of its walls curved inwardly, a fuel supply passage for said chamber, a door for said passage having air passages therein, a pair of spaced channels extending longitudinally of Vthe top portion of said fuel supply passage at each side thereofand having their outer end portions communieating with the air passages Vin said door,

the innei` end portions of said channels openmix with the ncompletely burned products ing into the combustion chamber opposite of combustion.

portions of the upper curved surfaces there- In testimony whereof we aix our sigl0 of whereby the warm air escaping from said natures. y

channels will iinpinge against the curved RICHARD JUDD.

surfaces and will be directed downwardly ERNEST TAYLOR.

in a swirling motion S0 as to thoroughly RALPH s. MCNANEYQ 

